Skjul div vha. funktion

function hideDiv(id,bool) {
  obj = (document.all)?document.all[id]:(document.getElementById)?document.getElementById(id):(document.layers)?document.layers[id]:new Object();
  obj.css = (document.layers)?obj:obj.style
  if (bool) obj.css.visibility = 'visible';
  else obj.css.visibility = 'hidden';
}

andetsteds
<div id="vaelger> en masse kode </div>
<a href=# onclick="hideDiv('vaelger',false);"> gem DIV </a>
<a href=# onclick="hideDiv('vaelger',true);"> vis DIV </a>

tak